Abstract

A working design of a simple retardance meter is indicated. The device permits direct, quick, and accurate measurement of the retardance, for example, of an oriented polymeric film which is intended for use as a phase changer plate in the production of elliptically polarized light. The method involves the direct compensation of the sample’s retardance using the calibrated retardance of a mica crystal which is variably tilted about one of its two principal planar axes. Several suggestions relating to the optical design, assembly, and calibration of the device are included.

© 1967 Optical Society of America

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References

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  1. W. A. Shurcliff, Polarized Light (Harvard University Press, Cambridge, Mass., 1962), Chapter 7.
  2. E. E. Wahlstrom, Optical Crystallography (John Wiley & Sons, Inc., New York, 1960), 3rd ed., p. 195.

Shurcliff, W. A.

W. A. Shurcliff, Polarized Light (Harvard University Press, Cambridge, Mass., 1962), Chapter 7.

Wahlstrom, E. E.

E. E. Wahlstrom, Optical Crystallography (John Wiley & Sons, Inc., New York, 1960), 3rd ed., p. 195.

Other (2)

W. A. Shurcliff, Polarized Light (Harvard University Press, Cambridge, Mass., 1962), Chapter 7.

E. E. Wahlstrom, Optical Crystallography (John Wiley & Sons, Inc., New York, 1960), 3rd ed., p. 195.

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Figures (3)

Fig. 1
Fig. 1

(a) Dispersion of phase angle of mica and of oriented polyvinyl alcohol film. Both are full-wave plates at normal incidence. Solid line, mica; broken line, polyvinyl alcohol. Phase angle in degrees, wavelength in mμ. (b) Tilt retardance of mica (white light Babinet unit). Broken line, 187-mμ retarder β-axis tilt, 5.4 mμ/deg. Solid line, 92-mμ retarder γ-axis tilt, 3.6 mμ/degree. Retardance in mμ, tilt angle (degrees).

Fig. 2
Fig. 2

(a) Section through the tube portion of the retardance meter, showing the internal arrangement (schematic) of the color and polarized filters in the ocular or upper section, and the variable and fixed value mica plates in the lower section. (b) Schematic section through the tubing and drum portions of the retardance meter, showing the internal arrangement of the parts of the tilting mechanism. (c) Cutaway plan view of the drum section of the retardance meter showing the design of the cam and lever parts which provide for a geared-down rate of change in the tilting action on the mica plate.

Fig. 3
Fig. 3

Calibration curve Retarder C0 = 106 mμ) mica plate. The curve shows the change of the retardance in mμ with the scale setting of a typical retardance meter employing a cam lever arrangement as described. At the middle portion of the range the ratio of the two rotations, i.e., of the drum and of the mica plate, is roughly 9 to 1.

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